Transmission for automobiles.



A. G. HERRESHOFF.

TRANSMISSION FOR AUTOMOBILES.

APPLICATION FILED JULY 8. Ian.

1,242,803. Patented Oct. 9,1917.

2 SHEETS-SHEET I- A. G. HERRESHOFF.

IBANSMISSION FOR AUTOMOBILES.

APPLICATION FILED JULY 5. 1917.

1342,803. Pawnted 0% 9,1917.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

ALEXANDER GBISWOLD HERBESHOFF, OF NEW YORK, N. Y., ASSIGNOB- TO INTER- NATIONAL MOTOR COMPANY OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TRANSMISSION FOR AUTOMOBILES.

Specification of Letters Patent.

Patented Oct. 9, 1917.

T 0 all whom it may concern:

Be it known that I, ALEXANDER Gmswono HnRRssHoFF, a citizen of the United States residing in the borough of Manhattan of the cit of New York, in the State of New York, ave invented certain new and useful Improvements in Transmissions for Automobiles, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to transmissions for automobiles and is concerned particularly with the rear axle construction and the driving elements incorporated therein whereb there is secured between the propeller sha t and the axle section a reduction of speed in addition to the usual gear reduction obtained in thetransmission housing. In accordance with the invention, the elements are arranged in a more simple and compact relation to each other than has heretofore been possible where a double reduction drive has been associated with the dilferential. A further object of the invention is to provide an improved housing on the rear axle for the double reduction gearing which housing caries a detachable cap in which are journaled certain elements of the transmission wall. In addition to this cap there -is an independent removable section in which are journaled certain other elements removable as a unit with the cap. The details of the inveption will appear in connection with the following description of the accompanying drawings, in which- Figurel is a conventional view'in plan of a fragment of a motor truck having a rear axle drive embodying the improvements.

Fig. 2 is an enlarged detail view in transverse section taken through the rear axle of the truck shown in Fig. 1 and on the 'plane indicated by the line 22 of Fig. 1

and looking in the direction of the arrows.

Fig. 3 is a detail view in section taken along the plane indicated by the line 3 -3 of Fig. 1 and looking in the direction of the arrows.

The truck a is provided with a housing 6 for the transmission gearing from whlch the drive is transmitted to the traction wheels 0 through a propeller shaft d ex tending to the rear axle. The rear end of the pro eller shaft carries a flanged couplingd bolted to a corresponding flanged coupling member e on the front end of a stub shaft e of adriving bevel pinion e, the end bearing 6 of which may be formed with the section k of the differential housing. The bevel inion e meshes with a large bevel gear 9, w ich is also mounted on a short shaft g. extending transversely of the cap f of the differential housing and provided with roller bearings g mounted on roller races g supported on a separate detachable section It restlng on the main differential housing 71. On the same shaft g with the large bevel gear g is formed a spur pinion g in mesh with a large spur ear is formed on the spider is of the difi'erential proper, this spider being rovided with the smaller bevel pinions k w ich are in constant mesh with evel gears l on the ends of the axle sections m. This diiferentialoperates in a manner well known. The frame k for the differential has its ends extended, as at is and shouldered to receive roller bearings k which run on roller races supported within the casing.

By the construction described it will be evident that the power transmitted throu h the shaft (2 is given a double reduction y the engagement of the bevel pinion c with the larger bevel gear 9 and the subsequent reduction between the spur gear and the master gear is of the difi'erentia It will also be evident that this reduction and arrangement of cars are such as to insure the greatest possigle simplicity and, compactness. One of the principal features of the invention has to do with the construction of the cap sections f, h, carried on the housing i and the arrangement of bearingsa within these cap sections, whereby it comes possible to remove as units one or more of the drivin pinions and their bearings without distur in any of the other parts. This accessibility or inspection and repair is of great importance in a construction in which there is employed a great number of driving parts. For instance, referring to Fig. 3, it will be evident that when the cap section f is removed, the bevel pinion 6, gear 9 and spur gear g are all exposed to view and readily accessible and yet none of these parts are disturbed. When the primary reduction gears, including the bevel pinion e bevel gear g and spur pinion g, are to be removed to facilitate accessibility to the master gear and its parts, it will e quite evident that the supporting races 9' my be removed from .theigflaces on the removab interim t0 shaft 9' and'jassoeiatedelements nmygbe; removed as a unit difierential by removing the bolts n and takin oil the two up r cap sections f, It,

to er. This ready emountability is'very desirable where it is necessary to obtain access to the difierential, and'by mounting the bearin for the first reduction elements wholly wit this detachable unitary'cap section, theamount of labor involved in disassembling the parts, as described, is mate-1 rially reduced.

The structural features emphasized herein are made the subject matter of the ap-- 2. In an automobi e transmission, in conibination with the propeller shaft and differential a housing for the difi'erential a le cap on] the housing, a beve ed pinion on the end of. the propeller shaft ournaled, in the casing, a beveled gear journaled in the -cap, a spur pinion carried with the beveled gear, and a spur gear on the difl'erential enmeshed with the spur pinion.

desired, the

bination with the propell I 3. In an automobile transmission, in combination with the propeller shaft and difiefit 40 pic, 1 horizontal plane a ca deta ll to the housing p y Ion the end of the propeller shaft journaled ential, a housinffor the dilferential a beveled pinion in the housing, a beveled gear journaled in the cap, a spur pinion camed with the beveled gear, and a spur gear on the difl'erentlal enmeshed with the spur pinion.

4. In an automobile transmission, in comer shaft and diflerential, a housing for the differential split along a horizontal plane, a detachable cap for the housing formed in two sections a beveled pinion on the end. of the propel er shaft 'ournaled, in one of .said sections, a bevel gear journaled in the other of said sections, a spur pinion carried with the beveled gear, and a tsfimr gear on the difierential enmeshed wi the spur inion.

5. In an automobile transmission, in combination with the propeller shaft, axle sections and differential, a housing split alon a horizontal plane in which the difierentia is journaled, a detachable cap carried on the housing, a beveled pinion on the end of the propeller shaft journeled in the cap, a beveled gear meshed with the beveled pinion, a stub shaft on which the beveled gear is carried 'ournaled in the ca a s ur pinion fo on the stub sha an a spur gear on the diflerential enmeshed with the spur pinion.

TlllS 'fication signed this 3d day of July, A. .1917.

umnrnna emswotn asmsfion. 

